This product adopts bottom switch button.The first battery mod with a decorative ring power indicator:When the battery power is above 80%,blue light flashes; when the battery power between 30-80%, green light flashes; when the battery power below 30%,red light flashes.The power varies with the resistance, and the power range is 30w-120w. Press the button 3 times quickly within 1s starts dry burning mode and it continuous burns 15s.Perfect match with Smokjoy Mushroom Cloud RDA.